alt Hacker NewsTaxes are a subject of frequent liberal conspiracy theories. You will see all sorts of blatantly false claims like this because left wing misinformation spreaders like Robert Reich make up their own tax calculations that have no relation whatsoever to actual tax law.
No need to limit this to "liberal" conspiracy theories. Trump and his admin's statements on how tariffs and other taxes work and who pays them have been full of blatantly false claims.